Begin by suctioning fluid from the reservoir. Disconnect the hydraulic line, remove the under-dash panel, and pull out the clevis pin. Remove the master cylinder mounting nuts and detach from the firewall. Replace the reservoir, drive out the roll pin, and pry out the old seal. Install the new seal, lubricate with brake fluid, and press the reservoir into place. Install the new roll pin, refill the reservoir, check for leaks, and bleed the system.